EP0568104A2 - Installation de pyrolyse et de combustion - Google Patents

Installation de pyrolyse et de combustion Download PDF

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Publication number
EP0568104A2
EP0568104A2 EP93107087A EP93107087A EP0568104A2 EP 0568104 A2 EP0568104 A2 EP 0568104A2 EP 93107087 A EP93107087 A EP 93107087A EP 93107087 A EP93107087 A EP 93107087A EP 0568104 A2 EP0568104 A2 EP 0568104A2
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EP
European Patent Office
Prior art keywords
pyrolysis chamber
air
thermoreactor
waste
pyrolysis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93107087A
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German (de)
English (en)
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EP0568104A3 (en
EP0568104B1 (fr
Inventor
Marjan Remic
Franc Zeleznik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kiv Kovinska Industria Vransko d o o
Original Assignee
Kiv Kovinska Industria Vransko d o o
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Application filed by Kiv Kovinska Industria Vransko d o o filed Critical Kiv Kovinska Industria Vransko d o o
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Publication of EP0568104A3 publication Critical patent/EP0568104A3/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
    • F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/30—Pyrolysing
    • F23G2201/303—Burning pyrogases

Definitions

  • the invention relates to a smoldering and incineration plant for the disposal of special waste, in particular non-recyclable organic waste, with a metering system in which the waste is taken up for further processing, a pyrolysis chamber for the smoldering process, the waste being heated, dried and split up, a thermoreactor for the oxidation process, in which the flue gas generated from the waste is burned out, and a control device for monitoring and setting process parameters.
  • Such systems are widely known in the prior art, they are used for thermal waste disposal, in particular of household waste, with the waste initially becoming carbonized with the extensive exclusion of oxygen and the carbonization or flue gas produced being converted to high-energy fuel gas in a second stage.
  • thermoreactor or in the second stage mentioned is of particular importance, since very high temperatures of over 1000 ° C. have to be achieved.
  • thermoreactor A smoldering and incineration plant of the type mentioned at the outset is known, for example, from EP-B 0 302 310.
  • the combustion in the thermoreactor is effected by a high-performance burner, which is designed for a temperature above 1200 ° C.
  • thermoreactor with an afterburning chamber, particularly good results being achieved in particular by the precisely defined residence time of the flue gases in a residence zone of the thermoreactor and the Afterburner should be achieved.
  • EP-B 0 126 407 proposes to form waste into granules, which surprisingly reduces its moisture content.
  • DE-A 41 07 200 also relates to a method and a plant for thermal waste treatment, in which hazardous waste at a relatively low temperature largely with the exclusion of oxygen is carbonized, whereby a flue gas and a residue are formed.
  • the residual material is separated into a fine fraction and a coarse fraction.
  • the coarse fraction is excreted, while the fine fraction as well as dusty, dry waste or liquid waste and the flue gas are burned.
  • DE-C 38 02 319 describes a conveying device for the waste for a smoldering device, by means of which the filling or emptying of the smoldering drum or the pyrolysis chamber should be possible without environmental pollution.
  • the waste is pressed together at the entrance end of a pipe which serves as a container and in this way forms a gas-tight seal, the further conveying of the waste being carried out by a circulating device.
  • the closure ensures that no gases formed during the charring can escape.
  • DE-C 41 01 704 proposes to provide a special nozzle insert in the flame tube. These nozzles, with which air is supplied, are inclined towards one another and offset in two groups of three nozzles each. This is to ensure that sufficient combustion air is supplied.
  • EP-A 0 360 052 is looking for an inexpensive solution for a pyrolysis reactor by providing a burner with a direct fresh air supply for direct heating in a combustion chamber or a thermoreactor.
  • DE-U 91 00 724 proposes to design a flame tube in such a way that the guidance of the fuel gases is meandering.
  • thermoreactor which consists of a plurality of individual burners, which are arranged on the circumference of the chamber of the thermoreactor, the nozzles of the individual burners each at an angle ⁇ with respect to the direction of Gas stream and are oriented at an angle ⁇ with respect to the circumferential normal.
  • a complete combustion is achieved by the combustion arrangement, because a larger number of burners set up at the angles ⁇ and ⁇ causes spiral whirling, as a result of which passage of the unburned flue gases is avoided and at the same time the combustion path of the flue gases is considerably lengthened.
  • the usually provided fireclay covering being subject to a more uniform and therefore more favorable load. Due to the rotating gas flow, a longer residence time of the gas in the thermal chamber is achieved. The same heating output and an even better effect can therefore be achieved here with a relatively inexpensive burner arrangement.
  • a first air stream can be introduced into the pyrolysis chamber as primary air in a controllable amount.
  • a second air stream is also advantageous for the thermoreactor upstream of the combustion device Secondary air can be supplied in a controllable amount.
  • a burnout zone can also be formed in the thermoreactor downstream of the combustion device, into which a third air stream can be introduced in a controllable amount as tertiary air.
  • the carbonization process in the pyrolysis chamber will take place with only a small air supply.
  • the targeted supply of secondary air and tertiary air to the thermoreactor ensures that the organic substances in the flue gas are completely burned out to the permitted limit values.
  • a smoldering and incineration plant which works according to the above-mentioned principles, can be used to dispose of special waste, in particular residues, such as those produced in the textile, paper, wood, leather and food industries. Since the system is inexpensive and can also be made compact, it can be used on site also treat hospital waste, waste generated in hotels, etc. Here, in particular, it can make economic sense to carry out waste disposal decentrally instead of using central waste disposal facilities.
  • the firing device in the thermoreactor delivers particularly good firing results if the size of the angle ⁇ is approximately 30 °, the size of the angle ⁇ is approximately 10 °.
  • the number of individual burners is generally not subject to any restrictions. The required number will depend on the required temperature in the system, the calorific value of the material to be burned and also the chemical composition of the material. Embodiments have proven successful in which an odd number of individual burners, for example nine, have been used.
  • the metering system expediently has a charging device for conveying the waste material to the pyrolysis chamber, the charging device being able to be operated only when a cover provided for the filling opening of the metering system is closed. So there are the waste materials through a Filled opening, then this is closed with a lid and locked if necessary. Only now is an automatic loading of the pyrolysis chamber possible. The frequency of loading depends on the temperature in the pyrolysis chamber, the calorific value of the waste materials and the speed at which the process is run.
  • a passage from the metering system to the pyrolysis chamber can be closed by a door which can be actuated by a slide, preferably a vertical slide.
  • the vertical slide closes or opens the door and, in cooperation with the loading device and also the lid of the filling opening, ensures that a supply of false air into the pyrolysis chamber or an undesired smoke escape from the pyrolysis chamber is prevented.
  • the temperature control for the pyrolysis chamber is accomplished in different ways. First of all, it is advantageous to provide injection cooling in the pyrolysis chamber, in which cooling water is introduced into the interior of the pyrolysis chamber in a controllable amount through injection nozzles.
  • the amount of cooling water flow can be regulated, for example, by an electromagnetically controlled valve.
  • the temperature in the pyrolysis chamber drops and charring is delayed.
  • the measure specified can ensure the gasification conditions in such a way that a constant temperature is maintained and the burning with an open flame is prevented.
  • This system can be very flexible be designed.
  • the temperature can be detected, for example, via one or more temperature probes, the temperature values are then fed to the control device, which ensures the water supply to the water nozzles, which can also take place in several injection stages.
  • the bottom of the pyrolysis chamber can consist of fixed, rigid grates.
  • the pyrolysis chamber has a floor made of movable grates which are designed such that fuels and / or ashes resting on the grates are transported to an ash shaft by their movement.
  • Cast iron has proven itself as a material for the gratings.
  • the grates can be moved by means of a special hydraulic unit, which also makes it possible to regulate the speed. With this type of conveying of the material resting on the grates, no dusts are caused, which in turn advantageously contributes to the functioning of the metering system being guaranteed.
  • the strong blowing of primary air is also excluded.
  • Ash removal takes place with the aid of a continuously conveying discharge device, for example one or more screw conveying devices.
  • a continuously conveying discharge device for example one or more screw conveying devices.
  • a first screw conveyor device can be provided below the grates, which removes the coarse portion of the ash, and another screw conveyor device can also be located below the grids, which removes the fine portion of the ash.
  • the first screw is expediently arranged after the second, so that the entire fine fraction is first removed.
  • Nozzles for introducing the primary air into the interior of the pyrolysis chamber are advantageously provided for both types of grids, both for fixedly mounted and for movable ones. This ensures an even distribution of the primary air.
  • the size of the outlet opening from the pyrolysis chamber to the thermoreactor can advantageously be adjusted depending on the amount of fuel and the type of fuel.
  • the pyrolysis chamber can be cleaned or repaired from a chamber door.
  • thermoreactor there are high temperatures of 800 to 1200 ° C with a sufficient reaction time and for complete combustion intensive air mixing necessary. All of these conditions can be advantageously influenced by suitable shaping, it having proven to be expedient if the thermoreactor is composed of a large number of cylindrical steel elements which can be lined with chamotte. This applies in particular to the burnout zone, to which the tertiary air is also supplied, whereas the outer skin of the thermoreactor is air-cooled in the inlet part. It is achieved that in this part the best possible mixing of the fuel gases with the air and in the rear part of the thermoreactor the best possible burnout with a very long residence time is possible.
  • the thermoreactor is divided into three zones, namely the first mixing zone with secondary air supply, the ignition zone and the burnout zone with regulated tertiary air supply.
  • the air used for cooling the steel jacket of the pyrolysis chamber is returned as primary air, secondary air, tertiary air and / or air for the combustion device into the smoldering and combustion process.
  • a flue gas neutralization device and / or a flue gas purification device can also be connected downstream of the heat exchanger, in which washing devices and / or filters are provided according to legal requirements.
  • the control device takes over all adjustments and changes of the process parameters which are essential for the process control.
  • this does not only concern the temperature in the pyrolysis chamber and the thermoreactor, but in particular also the supply of primary air, secondary air and / or tertiary air.
  • This is advantageously done in each case by a fan operated by an associated electric motor, which blow the air into the pyrolysis chamber or into the thermoreactor, the respective amount of air being controlled via the circulation frequency of the respective electric motor.
  • control device also takes over the dosing of the waste material, possibly the supply of secondary fuel to the burners (i.e. gas), the monitoring of the output emissions, etc.
  • the control device is designed so that the amount of primary air can be adjusted depending on the temperature in the pyrolysis chamber, the oxygen content in the pyrolysis chamber and / or the size of the negative pressure in the thermoreactor.
  • the air volumes can be quickly adapted to the requirements. If limit temperatures are reached or limit values for carbon monoxide and other flue gases in the flue, for too large a quantity of the gases passing from the pyrolysis chamber into the thermoreactor or if other parameters become critical, the air supply can be throttled without delay.
  • the control device is designed in such a way that changes are also perceived and inserted into the control process.
  • FIG. 1 shows schematically an overall view of a smoldering and incineration plant according to the invention.
  • the waste materials to be thermally processed are introduced into a metering system 10, specifically through a filling opening at the top of the metering system 10, which can be closed with a cover 12.
  • a loading device inside the dosing system 10 ensures that the waste materials are transported towards a door to a pyrolysis chamber 20, the door being able to be opened and closed by means of a vertical slide.
  • the loading device and the vertical slide 14 are actuated by a hydraulic drive 16. Behind that of the vertical slide 14 lockable door there is a passage 18 which opens into the pyrolysis chamber 20.
  • the feeder now operates to direct the waste material into the passage 18, the speed of the material towards the pyrolysis chamber 20 becoming ever slower. This prevents new wastes from being poured over those that are already in the pyrolysis chamber 20.
  • the loading device has a sliding piston, which operates in cycles and is withdrawn at high speed after slow advancement. The loading system can only work if the cover 12 is closed. The retraction of the sliding piston is preferably effected when the vertical slide 14 is lowered. Overall, a lock effect is achieved in that no outside air can break into the pyrolysis chamber when the vertical slide 14 is in its upper position, i.e.
  • the pyrolysis chamber 20 has two symmetrically positioned burners 22 in its lower region, which ensure that a temperature between 300 and 800 ° C. can be reached at which the charring process takes place. This consists in heating, drying and splitting the waste material.
  • Primary air is introduced into the pyrolysis chamber 20 via a fan 24.
  • the process parameters in the pyrolysis chamber 20 are controlled in such a way that the amount of flue gases passing from a gas outlet shaft 26 into a thermoreactor 30 is constant.
  • the pyrolysis chamber 20 is constructed in such a way that it enables complete regulation of the processes taking place therein.
  • the outlet opening of the gas outlet 26 in the transition to the thermoreactor 30 is designed to be enlarged or can be reduced, which can be made dependent on the amount and type of fuel. Ash and solids that are already to be removed from the process can be disposed of by means of two screw conveying devices, as will be described in more detail below in connection with FIG. 5.
  • a door 28 enables the cleaning and, if necessary, the repair of components within the pyrolysis chamber.
  • secondary air is in turn introduced with the aid of a fan 37, namely downstream of a combustion device 32 which, as will be described in more detail in connection with FIGS.
  • thermoreactor 30 consists of a plurality of cylindrical steel elements 34 downstream of the combustion device 32 so that it can be removed from standard components to a length corresponding to the requirements.
  • the length of the thermoreactor 30, that is to say the number of steel elements 34 depends on the desired residence time of the fuel gases in the reactor. They define the burnout zone, into which tertiary air is supplied by means of another fan, which is not shown here, in order to optimize the combustion.
  • the exhaust gas temperature behind the thermoreactor 30 is, depending on the fuel, up to 1200 ° C. If there is no sensible use of heat, the hot exhaust gases can be discharged directly behind the thermoreactor 30 from a flue 70, in the outlet area of which a flue gas sensor is arranged, which enables the gases emerging from the flue 70 to be checked for their pollutant content.
  • the controllable supply of air quantities into the individual combustion zones of the smoldering and combustion system is important.
  • the temperature in the pyrolysis chamber 20 is kept within the respective necessary limits via the burner or burners 22 in the pyrolysis chamber and the automatic air volume control of the primary air.
  • the supply of secondary air into the inlet area of the thermoreactor 30 enables an optimal gas and air mixture, which is achieved further downstream with the help of the burners of the combustion device 32.
  • With regular addition of automatically regulated tertiary air complete burnout is finally achieved.
  • FIG. 2 shows a cross-sectional view of the thermoreactor 30 with one of the individual burners 321 of the combustion device.
  • the gases entering through the gas outlet 26 from the pyrolysis chamber are indicated by the arrow in their direction of flow.
  • the main flow direction lies in the direction of the central axis of the thermoreactor 30.
  • the individual burners 321 are inclined to this main flow direction by an angle ⁇ , which in the selected exemplary embodiment is approximately 30 °.
  • FIG. 3 shows the arrangement of the individual burners 321, 322, 323, 324, 325, 326, 327, 328, 329 on the thermoreactor 30, the viewing direction being downstream of the gas.
  • An example of the individual burner 321 can be seen that, like all other individual burners, it is inclined by an angle ⁇ with respect to the circumferential normal of the cylindrical thermoreactor 30. Through this as it were double inclination of the individual burners, the desired swirling of the gases is achieved inside the thermoreactor 30 and at the same time a relatively long residence time is obtained in the burnout zone.
  • control device indicated in FIG. 1 by a control cabinet 130 takes over the coordination and regulation of the process parameters, as has been explained in the preceding description.
  • Many options can be provided, for example a savings program can be installed, i.e. if no waste material is added for a long time, the primary and secondary air quantities are reduced, which also reduces the gas consumption.
  • FIG. 4 shows a top view of the dosing system 10, in which the waste is taken up for further processing, with particular problems arising from the fact that a long way is necessary for conveying the waste into the pyrolysis chamber.
  • three hydraulic cylinders 100, 102, 104 are provided, two of which 100, 104 on the frame 106, the third 102, which lies between the other cylinders 100, 104 and acts in the opposite direction, on the metering piston 108, which pushes the waste towards the pyrolysis chamber. This ensures that the pushing force acts exactly in the middle on the two clamping sides.
  • a sensor or a sensor arrangement is provided for precise speed control and also for the visual representation of the movement of the sliding piston on a screen.
  • the dosing intervals and amounts of waste are monitored and controlled by the control device.
  • FIG. 5 shows some details of the pyrolysis chamber.
  • the material is passed through the passage 18, which has already been described in connection with FIG. 1, into the pyrolysis chamber 20.
  • a water nozzle 112 in the passage 18 a plurality of water nozzles can also be provided if necessary - which serves to moisten the waste that passes through.
  • Further water nozzles 114a, b, c are arranged in the interior of the pyrolysis chamber 20, 6 water nozzles being provided in a preferred embodiment, only three of which are shown here in an exemplary arrangement. These water nozzles are under the control of the control device, as already described.
  • two screw conveyors 120, 122 are provided for the ash cleaning, which are operated in such a way that the dust material falling through the grids 124 is removed from the first screw conveyor, the coarser material, that is to say the coarse fraction of the ash, however by the screw conveyor 122, which is arranged at the end of the path of the grids 124.
  • the arrangement of the grids 124 is slightly inclined towards the end of the pyrolysis chamber, in particular towards the door 28.
  • the fine portion of the ash preferably falls into a specially provided chamber so that dusting is reliably prevented.
  • the transition to the thermoreactor takes place through the gas outlet 26, for which a slide 126 is provided which increases or decreases the opening of the gas outlet 26 in a controlled manner.
  • the pyrolysis chamber 20 is provided with an inner covering 128 made of a large number of firebrick bricks, which is covered with an insulating material.
  • the closure to the outside takes place via an airtight seal Steel chamber 129, which is air-cooled, optionally supported by a forced flow with the aid of fans.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Incineration Of Waste (AREA)
  • Paper (AREA)
  • Processing Of Solid Wastes (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Fertilizers (AREA)
EP93107087A 1992-04-30 1993-04-30 Installation de pyrolyse et de combustion Expired - Lifetime EP0568104B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI9200068 1992-04-30
SI9200068A SI9200068A2 (sl) 1992-04-30 1992-04-30 Toplotni vir termoreaktorja

Publications (3)

Publication Number Publication Date
EP0568104A2 true EP0568104A2 (fr) 1993-11-03
EP0568104A3 EP0568104A3 (en) 1993-12-15
EP0568104B1 EP0568104B1 (fr) 1997-03-19

Family

ID=20430940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93107087A Expired - Lifetime EP0568104B1 (fr) 1992-04-30 1993-04-30 Installation de pyrolyse et de combustion

Country Status (7)

Country Link
EP (1) EP0568104B1 (fr)
AT (1) ATE150535T1 (fr)
DE (1) DE59305829D1 (fr)
DK (1) DK0568104T3 (fr)
ES (1) ES2101154T3 (fr)
GR (1) GR3023736T3 (fr)
SI (1) SI9200068A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2703716A1 (fr) * 2012-08-28 2014-03-05 Linde Aktiengesellschaft Chauffage d'un gaz d'échappement de processus
WO2015074093A1 (fr) 2013-11-25 2015-05-28 Entech - Renewable Energy Solutions Pty.Ltd. Appareil destiné à assurer l'amorçage et la combustion d'un gaz de synthèse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595181A (en) * 1970-04-15 1971-07-27 Air Preheater Air modulation for waste incinerator
US3881431A (en) * 1974-06-19 1975-05-06 Sabatino Disabatino Incinerator
DE2731549A1 (de) * 1976-07-16 1978-02-09 Kelley Co Inc Vorrichtung zur bewegung und entfernung nicht brennbaren materials aus einem verbrennungsofen
US4800824A (en) * 1987-10-13 1989-01-31 Aqua-Chem, Inc. Pyrolytic incineration system
EP0338183A2 (fr) * 1988-04-22 1989-10-25 Howorka, Franz Dispositif pour décomposer thermiquement des substances polluantes fluides
US4987837A (en) * 1990-01-02 1991-01-29 Detroit Stoker Company Siftings removal device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595181A (en) * 1970-04-15 1971-07-27 Air Preheater Air modulation for waste incinerator
US3881431A (en) * 1974-06-19 1975-05-06 Sabatino Disabatino Incinerator
DE2731549A1 (de) * 1976-07-16 1978-02-09 Kelley Co Inc Vorrichtung zur bewegung und entfernung nicht brennbaren materials aus einem verbrennungsofen
US4800824A (en) * 1987-10-13 1989-01-31 Aqua-Chem, Inc. Pyrolytic incineration system
EP0338183A2 (fr) * 1988-04-22 1989-10-25 Howorka, Franz Dispositif pour décomposer thermiquement des substances polluantes fluides
US4987837A (en) * 1990-01-02 1991-01-29 Detroit Stoker Company Siftings removal device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2703716A1 (fr) * 2012-08-28 2014-03-05 Linde Aktiengesellschaft Chauffage d'un gaz d'échappement de processus
WO2015074093A1 (fr) 2013-11-25 2015-05-28 Entech - Renewable Energy Solutions Pty.Ltd. Appareil destiné à assurer l'amorçage et la combustion d'un gaz de synthèse
EP3074696A4 (fr) * 2013-11-25 2017-08-23 Entech - Renewable Energy Solutions Pty Ltd. Appareil destiné à assurer l'amorçage et la combustion d'un gaz de synthèse

Also Published As

Publication number Publication date
EP0568104A3 (en) 1993-12-15
ATE150535T1 (de) 1997-04-15
ES2101154T3 (es) 1997-07-01
DE59305829D1 (de) 1997-04-24
SI9200068A2 (sl) 1993-12-31
EP0568104B1 (fr) 1997-03-19
DK0568104T3 (da) 1997-09-22
GR3023736T3 (en) 1997-09-30

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